Method of slitting blanks for expanded load-bearing members



Jan. 22, 1929. 1,699,846

w. H. KLQCZKE METHOD OF SLITTING BLANKS FOR EXPANDED LOAD BEARINGMEMBERS Filed 001;. 30, 1926 Patented Jan. 22, 1929.

insane ATENT OFFICE.

WILLIAM H. KLOCKE, F WOODI-IAVEN, NEW YORK, ASSIGNOR TO KAL'MAITCOMPANY, INC., OF. CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE.

'METHOD OF SLITTING BLANKS FOR EXPANDED LOAD-BEARING MEMBERS.

Application filed October 30, 1926. Serial No. 145,356.

This invention relates to a method of slitting a metal blank inpreparation for subsequent expanding operations and utilize a blank ofspecial cross sectional form.

The cross section of the expanded load hearing member resembles that ofan I-beam and a blank similar in cross section to an I-beam is suggestedby the ultimate form of the cup anded load bearing member. I have found,however, that such a blank is disadvantageous by reason of the fact thatduring certain phases of the slitting operation its parts are presentedat obtuse angles to the shearing edges which results in an objectionabledragging effect and detracts from the oleanness and accuracy of theshear cut.

The object of the present invention is to provide a method such that theblank of special form may be slit with greater facility and effioiencythan a blank of regular Lform.

The invention is illustrated in the accompanying drawings in which:

. Figure 1 is a cross section of the blank.

FigureQ is a partial plan view thereof. Figure 3 is a cross sectionshowing a phase of the slitting operation.

Figure 4: is a plan view of a portion of the blank conforming to theoperation shown in Figure 3.

Figures 5 and 6 are cross sections on the respective lines 5-5 and 66 ofFigure 4:.

Figure 7 is a cross section showing the final phase of the slittingoperation.

Figure 8 is a plan view ofa portion of the blank conforming to theoperation shown in Figure 7.

Figure 9 is a central longitudinal sectional view of the blankconforming to the operation shown in Figure 7.

It will be understood that the blank after slitting may be treated inany suitable manner and by any suitable mechanism to eifect theexpansion and that the present invention is not concerned with detailsof the subsequent expansion steps for which reasons the illustration ofan expansion process applicable to the slitted blank is deemedunnecessary.

According to the invention the blank B as shown in Figs. 1 and 2 isprovided with parallel flanges 1 and a connecting web 2 which has awide-angled V cross section that provides angularly related longitudinalweb portions 2 and 2 The slitting rolls may be of any suitable typewhich operate by a shearing action in the manner tobe hereafter setforth and the slit ting is performed in two successive stages, the firststage by the rolls 3 (Fig. and the second stage by the rolls 4 (Fig. 7).In the first stage (Figs. 3 to 6) the blank is formed with the centralrow of slits 100 and in the sec- 0nd stage (Figs. 7, 8 and 9) with thetwo outer rows of slits 101, these being located closeto the web.

The wide-angled V cross section of the blankis of advantage as willappear from Figs. 3 and 7 in that the angle relativelyto the shearingedges of the portions which are displaced during the slitting is at nopoint greater than a right angle and this characteristic provides forgreaterfacility in the slitting operation than is possible where, in ablank of regular I-form, certain portionsot the web which would bedisplaced during the slitting operation would lie at an obtuse angle tothe shearing edge. i

It will be understood that the blank is fed through the slitting rollsin any suitable man ner and that the slitting operation'is preferablypracticed in connection with the delivery of the blank from the millstand and while the blank is at or near the degree of heat which it hadupon emergence from such stand. .Thus the rolls 4- are shown asmountedbetween feed rolls 14 which act onthe flanges 1 and such feedrolls which are driven by any suitable means (not shown) may be providedin any desired number or arrange ment.

In the first stage of the slitting operation as effected by the rolls3the portion 2" is moved into a plane normal to and located cen trallyof the flanges 1 and parts of the portion 2 which are incorporated withthe intermediate bonds are similarly displaced (Figs. 4 and 6) while theremaining parts of the por tion 2* are held in the original laterallyinclined plane (Figs. 3 and 5) andare thus sev cred from the adjacentparts of the portion 2. In the second stage of the slitting as effectedby the rolled the parts of the portions 2 which during the first stageare held in their original plane are moved into the same plane astheportion 2', that is to say, a plane normal to and located centrallyof the flanges 1 and from this common plane adjacent parts of both ofthe portions2 and 2 as well as the intermediate bond providing portionsare displaced into a common plane parallel to the plane from which thedisplacements started,

the portions so displaced being thus severed from the web along linesparallel and adjacent to the flanges and leaving in the plane from whichthe displacement started those portions which provide-the bonds betweenthe struts and the chords, i. e. the outer lines of portions areindicated at 102, the interme diate bond providing portions at 103, thepanel point providing portions at 104; and the chord providing portionsat 105.

Having fully described my invention I claim:

1. The method of slitting a blank for use in connection with theproduction of expanded load bearing members, said blank having marginalflanges and a wide-angled V-shaped web characterized by parallellongitudinal portions inclined laterally at opposite angles to oneanother, which consists in displacing one of said longitudinal portionsinto a plane normal to the flanges and simultaneously displacing atregular intervals parts of the second longitudinal portion into the sameplane while holding the remaining parts of the second longitudinalportion against displacement, thereby to shear said portionslongitudinally along regularly recurring lines and form a row of slits,andthen displacing regularly recurring parts of both of saidlongitudinal portions in which the parts between the ends of the slitsare included into a common plane parallel to said normal plane whileleaving intervening parts in said normal plane, thereby to shear saiddisplaced parts from the adjacent parts of the web longitudinally alongregularly recurring lines and form outer rows of slits.

2. The method of slitting a blank for use in connection with theproduction of expanded load bearing members, said blank having marginalflanges and a web characterized by parallel longitudinal portionsinclined laterally at opposite angles to one another, said portionsthereby having the cross section of a wide-angled V, which consists inshearing said portions from one another along regularly recurring lines,thereby to form a row of slits, and relatively displacing the parts ofsaid portions which lie at the sides of said slits, certain of saidparts being displaced into a plane normal to the flanges, and thenshearing both of said portions from adjacent parts of the web alongregularly recurring lines, thereby to form rows of slits at each side ofsaid first named row and displacing in the same direction as before andint-o a plane parallel to said normal plane the parts of saidlongitudinal portions adjacent the slits of said last named rows andleaving intervening parts in said normal plane.

3. The method of slitting a blank for use in connection with theproduction of expanded load bearing members, said blank having marginalflanges anda wide-angledV shaped web characterized by pa 'allellongitudinal portions inclined laterally at opposite angles to oneanother, which consists in iassing said web through cooperating rollsand by means of said rolls displacing one of said longitudinal portionsinto a plane normalto the flanges and simultaneously displacing atregular i11- tervals parts of the second longitudinal portion into thesame plane while holding the remaining parts of the second longitudinalportion against displacement, thereby to shear said portionslongitudinally along regularly recurring lines and forma row of slits,and then passing said web through other coop crating rolls and by meansof the same displacing regularly recurring parts of both of saidlongitudinal portions in which the parts between the ends of the slitsare included into a common plane parallel to said normal plane whileleaving intervening parts in said normal plane, thereby to shear saiddisplaced parts from the adjacent parts of the web longitudinally alongregularly recurring lines and form outer rows of slits.

4. The method of slitting a blank for use in connection with theproduction oi expanded load bearing members, said blank having marginalflanges and a web characterized by parallel longitudinal portionsinclined laterally at opposite angles to one another, said portionsthereby having the cross section of a wide-angled'V, which consists inpassing said web through cooperating rolls and. by means of said rollsshearing said portions from one another along regularly recurring lines,thereby to form arow of slits, and relatively displacing the parts ofsaid portions which lie at the sides of said slits, certain of saidparts being displaced into a plane normal to the flanges, and thenpassing said web through other cooperating rolls and by means of thesame shearing both of said portions from adjacent parts of the web alongregularly recurring lines, thereby to form rows of slits at each side ofsaid first named row and displacing in the same direction as before andinto a plane parallel to said normal plane the parts of saidlongitudinal portions adjacent the slits of said last named rows andleaving intervening parts in said normal plane. I

In testimony whereof I hereby aflix my signature.

WILLIAM H. KLOCKE.

